147 years old now in 2021 - what year born?


Today, 21 January 2021 if a person is 147 years old now, what year was he born? See below:


If 147 years old, year of birth is:
1873 or 1874*
*It depends on whether he was born before or after 1 January 1874.


If now 147 years and his year of birth 1873 if he was born after 21 January 1873 until 31 december 1873 inclusively, and his year of birth is 1874 if he was born from 1 January 1874 to 21 January 1874.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 13 years, year of birth 2007 or 2008
If now 29 years, year of birth 1991 or 1992
If now 49 years, year of birth 1971 or 1972

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